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Regarding the preparation of the salt spray corrosion test, according to the relevant national standards, it is roughly divided into the following situations
1. Preparation of sodium chloride solution
The reagents used in this test are chemically pure or above. Dissolve sodium chloride in distilled or deionized water with a conductivity not exceeding 20 μS / cm, and its concentration is 50 g / L ± 5 g / L. At 25 ℃, the density of the prepared solution is in the range of 1.025 5 ~ 1.0400.
2. Adjust the pH
Adjust the salt solution to the specified pH value according to the pH value of the collected spray solution.
2.1 Neutral salt spray test (NSS test)
Adjust the pH value of the prepared salt solution to be between 6.5 and 7.2. The pH value can be measured with an acidity meter. As a daily test, a precision pH test paper with a measurement accuracy of 0.3 can also be used. The pH of the solution can be adjusted with hydrochloric acid or sodium hydroxide.
The loss of carbon dioxide in the solution during spraying may cause a change in pH. Corresponding measures should be taken, for example, heating the solution to more than 35 ° C before sending it to the instrument or preparing the solution from fresh boiling water to reduce the carbon dioxide content in the solution and avoid changes in pH.
2.2 Acetic acid salt spray test (AASS test)
Add an appropriate amount of glacial acetic acid to the prepared salt solution to ensure that the pH value of the collected solution in the salt spray box is 3.1 to 3.3. If the pH value of the initially prepared solution is 3.0 to 3.1, the pH value of the collected solution is generally 3.1 to 3.3 Within range. The pH value is measured with an acidity meter. As a daily test, a precision pH test paper with a measurement accuracy of 0.1 can also be used. The pH of the solution can be adjusted with glacial acetic acid or sodium hydroxide.
2.3 Copper accelerated acetic acid salt spray test (CASS test)
In the salt solution prepared according to 2.2, copper chloride (CuCl2 • 2H2O) is added, and its concentration is 0.26g / L ± 0.02g / L (ie 0.205g / L ± 0.015g / L anhydrous copper chloride). The method of adjusting the pH of the solution is the same.
3. Filter
To avoid clogging the nozzle, the solution must be filtered before use.
Reference standard: artificial atmosphere corrosion test salt spray test GB / T10125-1997
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